JPH04332440A - Core for deflecting york - Google Patents

Abstract

PURPOSE:To improve electromagnetic characteristics of a deflecting york and stabilize the characteristics by coating two core pieces of a core for the deflecting york divided into two after baking with a thermal shrink film, and shrinking the film thermally so as to be fixed in one united body. CONSTITUTION:Two core pieces 1a and 1b of a core for a deflecting york divided into two after baking are combined together, and are sandwiched between separators 2, and a conical cylinder shape heat-shrinkable film 5 is coated around the both core pieces 1a and 1b. Next, when the film 5 is shrunk after heat is applied, as for installation of the film 5, the core pieces 1a and 1b are fixed in one united body by means of shrinkage force. Then, a cross sectional area of the core 1 is uniformized all over its periphery, and magnetic flux density is uniformized, so that electromagnetic characteristics can be improved as the deflecting york. Furthermore, since a clip groove is used as a molding metal mold and a projection part does not exist in it, raw materials can flow smoothly, and molding density of the core 1 is uniformized, so that the characteristics can be stabilized as the deflecting york.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core for a deflection yoke used in a CRT.

0002

2. Description of the Related Art FIG. 2 shows a conventional core for a deflection yoke. In the figure, 1a and 1b are the core pieces of the deflection yoke core 1 divided into two after firing, 2 is a separator that sandwiches the combined two core pieces 1a and 1b, and 3 is the two core pieces 1.
Clips 4a, 4b for fixing a, 1b together
A clip groove for fitting the clip 3 is provided in advance on both core pieces 1a and 1b. Both core pieces 1
a and 1b are fixed together by fitting the clip 3 into the clip grooves 4a and 4b.

0003

However, in the conventional core for a deflection yoke, clip grooves 4a and 4b must be provided in order to fix the two core pieces 1a and 1b. There was a problem. (1) Since the cross-sectional area of the clip grooves 4a and 4b is small, the magnetic flux in the core is concentrated in these parts, deteriorating the electromagnetic characteristics of the deflection yoke. (2) When molding the core, the movement of the raw material granule powder is partially obstructed by the protrusions of the mold for forming the clip grooves 4a and 4b, resulting in uneven molding density and The dimensional accuracy of the core, especially the roundness, decreases. Therefore, the characteristics of the deflection yoke become unstable.

The present invention was made to solve the above-mentioned problems, and an object thereof is to provide a core for a deflection yoke that can improve the electromagnetic characteristics of the deflection yoke and stabilize the characteristics. shall be.

[0005]

[Means for Solving the Problems] The core for a deflection yoke provided by the present invention has a heat-shrinkable structure in which two core pieces of a core for a deflection yoke, which are divided into two parts after firing, are placed over both core pieces and heat-shrinked. It has a structure in which it is fixed together with a film.

[0006]

[Operation] Since the core for a deflection yoke according to the present invention does not have a clip groove, which was conventionally indispensable, the cross-sectional area of the core is uniform throughout the entire circumference, and the magnetic flux density is also uniform. Therefore, the electromagnetic characteristics of the deflection yoke are improved. Furthermore, since it is not necessary to provide a convex portion corresponding to the clip groove on the molding die, the raw material granule powder moves smoothly within the cavity of the die and is not unevenly distributed in a specific location. Therefore, the molding density of the core becomes uniform, the dimensional accuracy of the core after firing, especially its roundness, improves, and the characteristics of the deflection yoke become stable.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the figure, 1a and 1b are core pieces of the deflection yoke core 1 which is divided into two parts after firing, and 2 is a separator that sandwiches the combined two core pieces 1a and 1b. Both show the same parts as in FIG. Reference numeral 5 denotes a heat-shrinkable film for fixing the core, which is integrally attached in a band shape to the outer peripheral surfaces of both the core pieces 1a and 1b by covering the two combined core pieces 1a and 1b and heat-shrinking the film.

[0008] The belt-shaped heat-shrinkable film is attached, for example, in the following manner. First, the two core pieces 1a and 1b of the deflection yoke core 1, which has been divided into two parts after firing, are combined and sandwiched between separators 2, and a conical cylindrical heat-shrinkable film 5 is placed around both core pieces 1a and 1b. Next, heat is applied to the film 5 to shrink it. In this way, the two core pieces 1a and 1b are fixed together by the shrinkage force of the heat-shrinkable film 5.

In the embodiment, the film 5 is attached to the core piece 1.
Although the case has been described in which the entire outer peripheral surfaces of the parts a and 1b are covered, the outer peripheral surfaces may be partially covered in a band-like manner.

As described above, in this embodiment, the core 1 is not provided with the groove for the clip, which is conventionally required, so that the cross-sectional area of the core 1 is uniform throughout the entire circumference, and therefore the magnetic flux density is also increased. It becomes uniform. Therefore, the electromagnetic characteristics of the deflection yoke are improved.

[0011] Furthermore, since there is no need to provide a protrusion for forming the above-mentioned clip groove in the molding die, the granular powder of the raw material flows smoothly in the cavity of the die.
It will no longer be unevenly distributed in specific locations. Therefore, the molding density of the core 1 becomes uniform, the dimensional accuracy after firing, especially the roundness, improves, and the characteristics as a deflection yoke become stable.

0012

[Effects of the Invention] As described above, according to the present invention, the two core pieces are fixed with a heat-shrinkable film, and there is no need to provide a clip groove, so that the electromagnetic characteristics of the deflection yoke can be improved. It is possible to improve the performance and stabilize the characteristics.

[Brief explanation of the drawing]

[Fig. 1] Side view of the deflection yoke core of the embodiment

[Figure 2] Side view of a conventional deflection yoke core

[Explanation of symbols]

1 Deflection yoke core 1a, 1b Core piece 2 of deflection yoke core 1
separator

Claims (1)

[Claims] 1. A core for a deflection yoke, in which two core pieces of the core for a deflection yoke, which are divided into two after firing, are fixed together with a heat-shrinkable film that is covered with both core pieces and heat-shrinked.